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with the growing penetration of the electric vehicles to our daily life owing to their economic and environmental benefits, there will be both opportunities and challenges to the utilities when adopting plug-in electric vehicles (PEV) to the distribution network. In this paper, a thorough analysis based on real-world project is conducted to evaluate the impact of electric vehicles infrastructure on the grid relating to system load flow, load factor, and voltage stability. Chatsworth distribution system was selected and tested along with different case scenarios utilizing the electrical distribution design (ED D) software to find out the potential impacts to the grid.

With the growing penetration of the electric vehicles to our daily life owing to their economic and environmental benefits, there will be both opportunities and challenges to the utilities when adopting plug-in electric vehicles (PEV) to the distribution network. In this paper, a thorough analysis based on real-world project is conducted to evaluate the impacts of electric vehicles infrastructure on the grid relating to system load flow, load factor, and voltage stability. IEEE 34 node test feeder was selected and tested along with different case scenarios utilizing the electrical distribution design (EDD) software to find out the potential impacts to the grid.

Power monitoring system is an important national infrastructure; its security has a vital position. In recent years, malicious attacks against power information systems emerge in an endless stream, which makes power systems worldwide suffer a major blow. Aiming at the hierarchical structure of the power monitoring system and the security threats it faces, this paper proposes a security immune model based on trusted computing technology. The security analysis shows that the model can guarantee the credibility of the power monitoring system.

Geomagnetic storms can cause earth surface potentials (ESPs) in the ground. ESP produces geomagnetically induced current (GIC) in a loop which is made up by rails and ground. If GIC flows into intercity railway track circuit, it will threaten the normal operation of track circuit. The reason that geomagnetic storms invade the track circuit was analyzed, and then how GIC affects the characteristics of choke transformers, was found. The calculation method of GIC according to a simulation based on the GIC flow path in the track circuit was built. Electromagnetic system model of choke transformer and track relay were designed in Maxwell software to get the magnetic flux density distribution of them. The results show that GIC values of 2.4 A can bring about serious direct current bias of choke transformers and cause the terminal voltage of track relay to decrease, resulting in relay malfunction. The numerical calculation results show that geomagnetic storms will interfere with intercity railway track circuit, which is in accordance with some phenomenon happened in some rail tracks. This method proves geomagnetic storms' influence on intercity railway track circuit and attentions should be paid to this influence.